This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 11 |
| 5 | 27 |
| 6 | 60 |
| 7 | 147 |
| 8 | 344 |
| 9 | 839 |
| 10 | 2031 |
| 11 | 5017 |
| 12 | 12379 |
| 13 | 30921 |
| 14 | 77407 |
| 15 | 195121 |
| 16 | 493451 |
| 17 | 1253613 |
| 18 | 3194303 |
| 19 | 8166757 |
| 20 | 20933754 |
| 21 | 53798919 |
| 22 | 138566312 |
| 23 | 357647565 |
| 24 | 924834079 |
| 25 | 2395702801 |
| 26 | 6215748612 |
| 27 | 16150985071 |
| 28 | 42024182520 |
| 29 | 109485000777 |
| 30 | 285578913962 |
| 31 | 745728542725 |